Electricity

Physics, Class- 10

Electricity

Electric circuits

Electricity travels in circuits

Electricity must have a complete path, or electrical circuit, before the electrons can move.

https://youtu.be/oB1v-wh7EGU

Multiple Choice

What is current measured in?

• Ω (Ohms)
• V (Volts)
• A (Amps)
• W (Watts)

Multiple Choice

Electric current is defined as

• detect electric current

• negative terminal to positive terminal

• positive terminal to negative terminal

• the flow rate of electric charges through a conductor

Multiple Choice

What is the amount of current flowing through an electric press, if the amount of charge passing through a conductor in 10 minutes is 300 C?

• 30 A

• 0.3 A

• 0.5 A

• 5 A

Open Ended

Calculate the number of electrons constituting one coulomb of charge.

(Hint: e =1.6 × 10^-19 C)

Open Ended

A current of 1 A is drawn by a filament of an electric bulb. Calculate the number of electrons passing through a cross-section of the filament in 16 s.

(Hint: I = Q/t and Q = ne)

Multiple Choice

which of the following represents voltage?

• Work done / (current x time)

• work done x charge

• (wordone x time) / current

• work done x charge x time

Multiple Choice

When an electrochemical cell no longer works, it is out of charge and must be recharged before it can be used again.

• True

• False

Multiple Choice

An electrochemical cell can be a source of charge in a circuit. The charge that flows through the circuit originates in the cell.

• True

• False

• Partly true

Battery is the source of energy required to push the charges.

The charge that flows through a circuit originates in the wires of the circuit. The charge carriers in wires are simply the electrons possessed by the atoms that make up the wires.

Multiple Choice

Charge becomes used up as it flows through a circuit. The amount of charge that exits a light bulb is less than the amount that enters the light bulb.

• True

• False

The rate at which charge flows is everywhere the same within an electric circuit.

The rate at which charge flows into a light bulb is the same as the rate at which charge flows out of a light bulb.

A battery is a device that stores chemical energy and converts it to electrical energy.

The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit.

Multiple Choice

The local electrical utility company supplies millions and millions of electrons to our homes everyday.

• True

• False

Multiple Choice

Charge flows through circuits at very high speeds. This explains why the light bulb turns on immediately after the wall switch is flipped

• True

• False

Charge moves abnormally slowly - on average, about 1 meter in an hour - through a circuit.

Yet as soon as a switch is turned to ON, charge located everywhere within the circuit begins to move.

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